MCQ On Biomolecule Class-12 » Chemistry-Papers

Carbohydrates have

–OH group

> C = O group

All

–CHO group

Guanine is an example of

a nucleoside

a nitrogenous base

a nucleotide

How many amino acids (approximately) are involved during the synthesis of protein?

Identify the pair of epimers

D-glucose and D-mannose

D-glucose and D-fructose

D-glucose and D-mannose

D-glucose and L-glucose

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Polysaccharide

Monosaccharide

Oligosaccharide

In iodine test of starch which colour of ppt had been observed

black

blue

red

Vitamin C must be supplied regularly in diet because

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

it is fat soluble hence stored in the body and cannot be used on regular basis

Which of the following statements is not correct?

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Except glycine, all other amino acids show optical activity

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

Fehling’s solution test is given by

lactose

all of these

fructose

glucose

Which of the following vitamins is water soluble?

Riboflavin

Vitamin E

Vitamin D

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 1)

(n – 3)

(n – 2)

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-galactose

D-mannose

D-fructose

D-glucose

Which one of the following is reducing sugar?

Cellulose

Glycogen

Starch

Fructose

Fructose reduce Tollen’s reagent due to

primary alcoholic group

secondary alcoholic group

enolisation of fructose followed by conversion of aldehyde by base

Osazone formation involves only 2 carbon atoms of glucose because of

reduction

oxidation

chelation

hydrolysis

Which carbohydrate is used in silvering of mirror?

(A) Sucrose

(D) B and C

(B) Fructose

D-Glucose and L-Glucose are

enantiomers

epimers

diastereomers

anomers

Find out the correct option among the following statements.

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Fehling’s solution and Tollen’s reagent are non-reducing sugar

Molisch’s test reagent is

1% of β-Napthol in alcohol

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

both

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and sucrose

fructose and sucrose

glucose and fructose

Biuret test is used for

Proteins

Fats

Sugar

The two monosaccharide units obtained on hydrolysis of disaccharide may be

both

different

same

Which of the following bases is not present in RNA?

Thymine

Adenine

Cytosine

Deficiency of vitamin E causes

Sterility Anaemia

Scurvy

Muscular weakness

Proteins are the polymers of -amino acids and they are connected to each other by ------

peptide bond

coordinate bond

ionic bond

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

1’ and 5’

5’ and 5’

5’ and 3’

3’ and 3’

Millon’s test is given by

Sucrose

ester

Proteins

Which one of the following is non-reducing sugar?

Glucose

Maltose

Fructose

Sucrose

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGAC

ATACACTC

ATACTGCA

Vitamin A is present in-

milk

all of these

butter

fish liver oil

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin D

vitamin H

vitamin B12

Which is a fat soluble vitamin?

Vitamin B6

Vitamin A

Vitamin C

Select the base which is not common in DNA and RNA.

Cytosine (C)

Uracil (U)

Adenine (A)

Guanine (B)

Glucose cannot be classified as ?